Improvement in calipers and dividers



L. SHELTERS.

Calipers.

Patented July 30, 1867.

Fay-4.

W/ 74/56856: //v VE/V 70 ex UNITED STATES PATENT OFFICE.

LEONARD SHELTERS, OF MANCHESTER, NEW HAMPSHIRE, ASSIGNOR TO HIMSELF ANDJOHN PATTEE, OF SAME PLACE.

IMPROVEMENT IN CALIPERS AND DIVIDERS.

Specification forming part of Letters Patent N 0. 67,360, dated July 30,1867.

To all whom it may concern.-

Be it known that I, LEONARD SEELrERs, of Manchester, in the county ofHillsborough and State of New Hampshire, have invented a new and usefulImprovement in Combined Calipers, Dividers, Square, and Rule; and I dohereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawings, and to theletters marked thereon, making part of this specification.

The same letters refer to like parts in all the figures of the drawings.

Fignrel represents the instrumentas opened for use as calipers foroutside measurement. Fig. 2 represents the same as opened for use as asquare. Fig. 3 represents the same as in use for dividers. Fig. 4.represents the same as opened for use as calipers for insidemeasurement.

A A are the jaws of the calipers. B B are the arms which form the squareand also serve as legs of the dividers in connection with the points HH, on which arms are marked the divisions of the scale, and which arepivoted by the pivot C, on which they freely turn.

C is the pivot by which the arms B B are connected together, and whichis placed on or near the sides of the arms B B, or on a projection onthe same, so as to admit of the slot F, or its equivalent, being cut inone of the arms or in such projection, and so as to admit of the stop Dbeing placed on one of such arms.

D is a stop on one of the arms to prevent them, when opened in eitherdirection, from turning more than a right angle, and so adjusted thatthe crossing of the arms, when extended so as to bear against it, formsa right angle or square at the point of crossing.

E is the projection on the arm B, in which is the pivot C, and in whichthe slot F is cut.

F is a slot out in one of the arms B B or in the projection E, for thepurpose of allowing of the operation of the thumb-screw G, or itsequivalent, to clamp the parts in any desired position.

G is a thumb-screw, the shoulders of which bear on the sides of the slotF, and when the screw is turned up clamp the parts in any desiredposition.

H H are points on the endsgof the arms B B to admit of the instrumentbeing used for dividers.

The construction and operation of the instrument is such that the twohalves or parts being united by the pivot C, when opened as shown inFigs. 1 and 3, it may be used as calipers for outside measurement. Whenopened as shown in Figs. 2 and 4 it may be used as calipers for insidemeasurement. When the arms B and Bare turned so as to bear against thestop D and form a right angle, as shown in Fig. 4, it may be used as asquare. When the arms B and B are at less than a right angle and clampedby the thumb-screw it may, by means of the points H and H, be used asdividers; and when in any position the arms may be held by thethumb-screw for any purpose desired, and in either position the arms Band B may be used as a scale or rule, as the same may be graduated.

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination of the calipers and arms B B, together with the points HH, forming the legs of the dividers and turning on the pivot C, and onwhich arms are marked the divisions of a rule or scale, and the stop D,the thumb-screw G in the slot F, or their equivalents, substantially asset forth.

, L. SHELTER-S.

Witnesses:

E. S. SMITH, S. N. BELL.

